* {margin: 0px; padding: 0px;}

body {width: 100%; height: 100%;}
#player {display: block; width: 50px; height: 50px; position: absolute; background-color: red; top: 0px;}

.collide {display: block; width: 150px; height: 150px; position: absolute; background-color: green;}
#collide1 {top: 150px; left: 450px;}
#collide2 {top: 150px; left: 250px;}
#collide3 {top: 450px; left: 150px;}
.playerpoint {width: 2px; height: 2px; background-color: black; display: block; z-index: 100; position: absolute;}